Since this is your field, maybe you can answer the question a lot of us have. How many of these group situation mass murderers have at some point been given these poisons?
Personally, I would like every doctor who prescribed them to these people who were totally unhinged by them could be charged with accessory to the crime, murder.
To answer your question: I don't know how many of these mass murderers have been on stimulant drugs, but let's not confuse the stimulants used to treat ADD and ADHD with the SSRIs (selective serotonin reuptake inhibitors,like Prozac) that are used to treat depression. Apparently there are quite a few kids who are very badly affected by SSRIs, and there's evidence linking these drugs to violent or suicidal behavior. Giving people a cocktail of anti-depressants, Ambien, and stimulants is a good way to cause problems. Competent psychiatrists I know are absolutely horrified by the practice of mixing drugs like this.
As for people coping with living with who they are, as you recommend, you may not understand the problems this can represent. If you can't t remember anything you study, no matter how hard you try, you're not going to be able to get through high school and earn a living. Or if somehow you manage to get through high school by the skin of your teeth, you won't be able to hold onto a job because you get confused, can't keep things straight, can't figure out what you're supposed to do, and get your supervisors furious with you. I've seen this among family members who were chronic screw-ups but turned into star employees by appropriate testing and medication. Do you really want to support people like that, or would you rather they just starve and die? Perhaps in centuries gone by they did starve and die, so they didn't pass on their bad genes.
There's definitely a genetic component to these problems, but I suspect there are things in our society that are making more people have attention-deficit disorder. I don't know, but the epidemic isn't just the result of bad parenting or lack of spankings.
Would you be convinced that this really is a brain malfunction if you could see the brain scans of people who have been diagnosed with ADD/ADHD?
Poisons? If you don't believe the personal stories you can read in this thread, I suggest you search out people whose children's lives were saved by the proper use of these drugs.